Yes the Doppler effect is used but let me explain. The trooper in the air can use a gun if he is not directly perpendicular i.e. ksickles speed on his R1 will be measurable.. Just like cops measure your speed as you round a curve. The speed indicated has some error because it doesn't reflect the perpendicular vector component of the velocity. Remember from physics velocity is both change in speed and direction i.e. it's a multidimensional vector. Usually this error work's in favor of the violator.

Yeah, and it'll be measured as just a few miles per hour because of what you just stated. Ergo, it is pointless to use a radar gun from the air unless you want to see a speed of just a few mph, or even negative if the plane happens to be flying away from the bike. That's why...wait for it... they don't do it.

__________________
He was a fattish but active man of paralyzing stupidity, a mass of imbecile enthusiasms—one of those completely unquestioning, devoted drudges on whom, more even than on the thought police, the stability of the Party depended. - George Orwell _1984_

Umm, kpaul, I feel it's time to speak up. I have a couple things in common with you, ie, I reside in south King County, WA and work at a large and well-known aircraft manufacturer.

And I do ride the finest piece of hardware known (to me, that is), a 2002 ZX-6R. But the similarities end there. You see, I'm just not smart enough to make my posts bold and italic like you do.

Anyway, you're a hypocrite. A couple days ago you raved about the WSP and their methods, and now you say you sport a new radar detector. Nuff said.

As for motorcycle trends... the trend I'm hoping to see is the trend towards practical and effiicient transportation with a fun and adventurous side. That's what biking will always be, and the image and lifestyle angles that clutter up the scene mostly detract from it.

Oh, enjoy going around Rainier, the long way, since Hwy 123 is closed this year. But you already knew that. Or soon will.

Close enough for Govt work i.e. to book you in the King County Jail history major

History major why don't come to my office so I can show you the math on my whiteboard.? It's possible to do it.. but I could be wrong i.e they might not use it. Basically all you have to have is some component of the violators velocity moving away from you or coming at you.. If the plane is circlcing ahead of the bike the trooper sticks his gun at the bike as it comming to him.. Remember that law enforcement can get down to 1500 ft or lower

----airplane-----

| 500 ft

| ----------------- 5280ft-------- <---bike

bike is 1 mile away from the plane and the plane is 500 ft off the ground so the angle is arch tan of (500/5280) around 5 degrees...So if the bike is going 2 miles / min or 120 mph his speed measured by radar gun in the airplane would be would be have error introduced by the angle. The lita even has name for it i.e the Cosine effect because you use the Cosine of the angle to compute the true speed of the bike from the speed read by the airplane.

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